Valve of internal-combustion engines.



M. E. DUNSGOMBE.

VALVE OF INTERNAL COMBUSTION ENGINES.

APPLIOATION FILED 111111122, 1911.

1,094,429. I Patented Apr. 28, 1914.

g g g I d] c d Q d d 1 e 5 a e F/ T b r"b 0 VA v Wihiessesnventor kw Attorney.

MATTHEW DUNSCO-MBE, OF BRISTOL, ENGLAND.

VALVE 0F INTERNAL-COMBUSTION ENGIN ES.

Specification of Letters Patent. Patented A p I'. 28, 1914.

-. Application filed June 22, 1911. Serial a... 634,682.

T 0 all whom it may concern Be it known that I, MATTHEW ERNEST DUNscoMnE, a subject of the King of Great Britain and Ireland, residing at 21 Sydenham road, (YOthan'nBriStol, England, optician, have invented certain new and useful Improvements in the Valves of Internal- Combustion Engines, of which the following is a specification.

This invention relates to four-stroke cycle internal combustion engines of the type having a reciprocating sleeve valve co-axial with the cylinder and working in conjunction with a controlling valve or valves and has for its object to provide a simpleconstruction of such an engine which'will permit of efficient and economical working.

According to the invention I provide a single sleeve vali'e to each working cylinder having therein one or more ports or sets of ports, arranged in a circumferential line or lines, that are adapted for the inlet as well as the exhaust, the opposing edges of the port or ports, when provided in a single circumferential line, or the ports themselves, when provided in more than one circumferential line, being alternately employed to open and close the cylinder ports and I-provide a controlling valve or valves cooperating therewith to serve for the admission of the combustible charge and the exhaust of the residual gases.

The invention is illustrated in the accompanying drawing which is a part sectional elevation of an engine cylinder provided with a sleeve valve and two rotary controlling valves. 1 a

In carryin the invention into efi'ect, according to t e construction shown in the drawing, the cylinder Z) is rovided with a Water jacket b outside which the sleeve valve a is adapted to reciprocate and the water jacket is extended outwardly from the closed end of the cylinder so that the valve at all points in its travel contacts with a water-cooled surface. The sleeve valve occupies the annular space between an outer casing b and the cylinder 5. The outer casing 6 extendsto the outer end of the water jacket where it is flanged to form the end of the annular chamber or space, in which the sleeve valve reciprocates. Ports 0 are formed inthe walls of the water jacket and cylinder near the end of the latter so as to serve both as inlet and exhaust ports, and the outer casing b is provided with valve cas- "the' interior of the cylinder.

'most posit-ion in its downward stroke.

ings g for the controlling valves d formed integrally with the outer casing b or secured thereto at positions adjacent the cylinder ports a referred to. Each valve casing is provided wit-h a cylindrical valve chamber for a rotatable controlling valve (land an inlet passage f and an exhaust passage 0 opening 3 therein atdetermined distances from a port 1 which 15 arranged opposite the corresponding cylinder port and is adapted, at intervals determined by the sleeve valve, to put the valve casing in communication with The contro ling valves each consist of a cylindrical body formed integrally with or mounted upon a continuously rotating spindle and channeled or recessed .outon diametrically opposite sides to form passages d of determined length by which, on rotation of the valve, the exhaust passage 6 and the inlet passage f of the valve casing are successively put in communication with the port 03 leading to the cylinder.

The sleeve valve consists of a hollow cylindrical body or sleeve valve a adapted to slide upon the exterior of the cylinder Wat/er jacket withinthe outer "casing and provided, with two sets of ports a arranged to put the cylinder into communication with the valve casing at or near the ends of the travel of the sleeve valve. The sleeve valve is reciprocated from the crank shaft by means of suitable connections and gear giving a one to four reciprocation of the sleeve valve with respect to the piston so that thus the combined inlet and exhaust ports 0 may be uncovered for the exhaust of the residual gases and for the inlet of the explosive charge at each cycle when the sleeve valve nears the ends of its travel. According to this speed ratio the sleeve, as shown in the drawing will have reached the lower- It will however be understood that the speed ratio and travel could be so chosen that the extreme portions of the sleeve a. cover the ports 0 during a cycle of the engine.

The water jacket of the cylinder is provided at each side of the ports 0 with packing rings to secure gas tight joints with the sleeve valve.

' By such a construction it will be under stood that while the sleeve valve a. is so mounted as to be free from leakage, the controlling valves are completely separated from the cylinder during the efi'ective stroke so that thus no practical diiiiculties are involved in their mounting.

A suitable screwed socket is provided in the end of the cylinder to receive the sparking plug. It will be understood that the invention is not limited to the construction hereinbefore described.

What I claim as my invention and desire to secure by Letters Patent is 1. In an internal combustion engine, the combination of a cyllnder having inlet and exhaust ports, a sleeve valve mounted to slide therein to permit of the alternate inlet and exhaust, said sleeve valve having a se ries of ports near each extremity, said sleeve having such a movement that theopposite edges of said ports alternately control the exhaust and the opening of the following inlet, means for imparting movement to said sleeve valve, and means for controlling the inlet and exhaust independently of said sleeve valve.

2. In an internal combustion engine the combination of a cylinder having inlet and exhaust ports, a sleeve valve mounted to slide therein to permit of the alternate inlet and exhaust, said sleeve valve having a series of ports disposed near each extremity, said sleeve valve having such a movement that the series of ports at the opposite ends of said sleeve valve alternately control the exhaust and the following inlet, one series of ports being out of operation while the other is in operation, means for imparting movement to said sleeve valve, and means for controlling the. inlet and exhaust independently of said sleeve valve.

In testimony whereof I have hereunto signed my name to this specification in the presence of two subscribing witnesses.

M. E. DUNSCOMBE. 

